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Thread: LRA Hydroboost Brake Upgrade Kit - replacement for vacuum pump assisted brakes

  1. #21
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    The hydrobooster simply replaces the vacuum booster , no changes to ABS or anything else are required.

    I bought a brand new genuine GM Tahoe A/C Delco Hydroboost unit from USA for $350 delivered , (Why you'd pay $2500 ++ for a local kit with Cardone aftermarket booster is beyond me ) and had the appropriate hoses & adaptors made by Wang Hydraulics for $250 . Used a Chevy astro van mount plate.

  2. #22
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    Smokey Yunick developed power brakes using residual power steering pressure about 50 years or more ago but NASCAR refused permission to use it. He did use it on Indy cars where the rule book was much thinner.

    Edit - He first used it in 1959 on the works cars he built for Pontiac. They had variable ratio power steering which was also a Smokey invention. Drum brakes as Nascar did not approve discs until 1971. Nascar told the team to take this stuff off. Driver, Fireball Roberts did not want the innovations until he ran a race with the PS and brakes. Fireball was alleged to have gone looking for Nascar tech manager with malice aforethought armed with the removed brake unit to feloniously insert or bash the techies with. Smokey actually did assault Joe Hunt at Indy with a faulty Joe Hunt magneto. Belted him in the head with the faulty unit. These were more robust times.
    URSUSMAJOR

  3. #23
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    Ive gone the other way with my EV and removed the Vacuum assist completely . Altogether much better .
    Raised the Master cylinder and fulcrum pin to get better MA, also decreased the MC bore size , Better pedal , more feel , and about the same effort as assisted brakes. Best thing don't need a noisy vacuum pump.

    http://goingbush.com/AULRO/233-2.jpg

  4. #24
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    Gm hydroboost adapted to RRC, Res, steering box, pump and cooler in system.

  5. #25
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    Quote Originally Posted by blackrangie View Post
    Only thing to consider would be legalities of removing ABS?
    It definitely would be an issue if the ABS was removed, but my understanding is that it replaces the master cylinder and vacuum booster only. ABS is further down the line so should still remain there.
    Mine - modified MY03 LT L318 Discovery 2a HSE Td5 15P
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  6. #26
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    Quote Originally Posted by goingbush View Post
    The hydrobooster simply replaces the vacuum booster , no changes to ABS or anything else are required.

    I bought a brand new genuine GM Tahoe A/C Delco Hydroboost unit from USA for $350 delivered , (Why you'd pay $2500 ++ for a local kit with Cardone aftermarket booster is beyond me ) and had the appropriate hoses & adaptors made by Wang Hydraulics for $250 . Used a Chevy astro van mount plate.
    Did you keep the Land Rover Master cylinder and reservoir? Or use the GM one? Or other?

  7. #27
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    Quote Originally Posted by J70nty View Post
    Did you keep the Land Rover Master cylinder and reservoir? Or use the GM one? Or other?
    You can use any master cylinder that you can make fit & will suit your requirement. In that case I used a GM unit. .

    On my Electric LandRover I removed the booster altogether & made an adaptor to mount a much smaller Datsun 120Y Master Cylinder direct to the pedal .


  8. #28
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    the only issue with the hydroboost system that I'm aware of outside of additional leak points (and this is not landrover specific) is that at low RPMs (or stalled engine) if you're into the brakes hard enough for the ABS to engage you can run low on hydraulic assist.
    Dave

    "In a Landrover the other vehicle is your crumple zone."

    For spelling call Rogets, for mechanicing call me.

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  9. #29
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    Quote Originally Posted by Blknight.aus View Post
    the only issue with the hydroboost system that I'm aware of outside of additional leak points (and this is not landrover specific) is that at low RPMs (or stalled engine) if you're into the brakes hard enough for the ABS to engage you can run low on hydraulic assist.
    With a stalled engine you still have assistance for a couple of applications from the accumulator
    Isuzu have the option of a dual pump I have one sitting here but have never felt the need to fit it in the 4 years I have had the hydroboost fitted .Seal kits were available for the Hb about $30 when I looked. I have not checked the PSI or GPM of the Isuzu versus the LR so there could be a difference
    Noel
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  10. #30
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    Quote Originally Posted by Ancient Mariner View Post
    With a stalled engine you still have assistance for a couple of applications from the accumulator
    Isuzu have the option of a dual pump I have one sitting here but have never felt the need to fit it in the 4 years I have had the hydroboost fitted .Seal kits were available for the Hb about $30 when I looked. I have not checked the PSI or GPM of the Isuzu versus the LR so there could be a difference
    Noel
    no issue with that it provides some applications from the accumulator, thats an ADR and pretty much has been since vac brakes came about.

    the issue for me is that on some vehicles if you get hard into the ABS at low engine revs (or with a stalled engine) you can burn through the accumulator while still in ABS due to the way the ABS pulses the pedal as feedback
    Dave

    "In a Landrover the other vehicle is your crumple zone."

    For spelling call Rogets, for mechanicing call me.

    Fozzy, 2.25D SIII Ex DCA Ute
    Tdi autoManual d1 (gave it to the Mupion)
    Archaeoptersix 1990 6x6 dual cab(This things staying)


    If you've benefited from one or more of my posts please remember, your taxes paid for my skill sets, I'm just trying to make sure you get your monies worth.
    If you think you're in front on the deal, pay it forwards.

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